On Monday night’s Late Night with Jimmy Fallon, Strokes’ frontman Julian Casablancas covered the Saturday Night Live classic “I Wish it Was Christmas Today.” Originally performed on SNL by Fallon, Chris Kattan, Tracy Morgan and Horatio Sanz, Casablancas received help from both Fallon and Sanz, as well as the Roots. While it may seem like Casablancas is taking the silliness out of the song with his uber serious shades and characteristic fierceness, once the two funnymen join him on stage, the rockstar cracks a smile and all is merry again. The song is available for purchase via iTunes, except today actually is Christmas…so there’s no need to wish.